Schwalbe tubes are designed & manufactured to retain air pressure considerably longer than their competitors. Not only is each individual tube inflated & inserted into a mould to ensure that there is even wall thickness & excellent air retention, they are also stored under pressure for 24hrs to test air retention. Valve length of 40mm for Standard version. Weight 145g. Applicable Tyre Sizes: 40-406 20 x 1.50 42-406 20 x 1.60 44-406 20 x 1.50 44-406 20 x 1.625 44-406 20 x 1.75 47-406 20 x 1.75 47-406 20 x 1.85 47-406 20 x 1.90 50-406 20 x 2.00 54-406 20 x 2.00 54-406 20 x 2.10 54-428 20 x 2.00 55-406 20 x 2.15 57-406 20 x 2.125 57-406 20 x 2.25 60-406 20 x 2.35 62-406 20 x 2.40 62-406 20 x 2.50 Specification Size : 20 Inch Length : 40 Width : 40 54 Diameter : 406 428 Weight : 147 Airtightness: Schwalbe tubes retain air pressure considerably longer. The quality and the material purity of the rubber mixture directly effects the quality of the tube. Each Schwalbe tube is individually inflated and inserted into a mold. This ensures the even wall thickness and excellent air retention. Reliability: Consistent quality control brings with it the security of use: Each tube is inflated at the factory and stored under pressure for 24 hours in order to test the air retention. Group Tube System: The high elasticity and quality material used in our tubes allows a great many tyre sizes to be covered. Only an extremely high-quality and reliable tube is up to this requirement. Retains pressure longer! In comparative tests against other tubes (including named brands, own-label brands and no name products). The result was clear. Over a period of 30 days the other tubes lost nearly twice as much pressure than Schwalbe tubes. Possible reasons: Less butyl content, or lower quality of butyl. Schwalbe is uncompromising in its standards, despite ever increasing world market prices of butyl. Please visit our website at http://www.ecomtb.com.my OR https://shopee.com.my/eco_mtb ** There is 1-3cm errors due to manual measurement. Please kindly understand. ** Actual product colour may slightly vary due to photographic lighting sources or your monitor settings. ** WE DO NOT DO COD ** ONLINE ONLY ** We support original products only. ** PRICE INDICATED IS ALREADY BEST PRICE, EXCLUDE COURIER